JWST Photometric Time-delay and Magnification Measurements for the Triply Imaged Type Ia “SN H0pe” at z = 1.78

Pierel, JDR, Frye, BL, Pascale, M, Caminha, GB, Chen, W, Dhawan, S, Gilman, D, Grayling, M, Huber, S, Kelly, P, Thorp, S, Arendse, N, Birrer, S, Bronikowski, M, Cañameras, R, Coe, D, Cohen, SH, Conselice, CJ, Driver, SP, DŚilva, JCJ et al (2024) JWST Photometric Time-delay and Magnification Measurements for the Triply Imaged Type Ia “SN H0pe” at z = 1.78. Astrophysical Journal, 967 (1). ISSN 0004-637X

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Abstract

Supernova (SN) SN H0pe is a gravitationally lensed, triply imaged, Type Ia SN (SN Ia) discovered in James Webb Space Telescope imaging of the PLCK G165.7+67.0 cluster of galaxies. Well-observed multiply imaged SNe provide a rare opportunity to constrain the Hubble constant (H 0), by measuring the relative time delay between the images and modeling the foreground mass distribution. SN H0pe is located at z = 1.783 and is the first SN Ia with sufficient light-curve sampling and long enough time delays for an H 0 inference. Here we present photometric time-delay measurements and SN properties of SN H0pe. Using JWST/NIRCam photometry, we measure time delays of Δt ab = − 116.6 − 9.3 + 10.8 observer-frame days and Δt cb = − 48.6 − 4.0 + 3.6 observer-frame days relative to the last image to arrive (image 2b; all uncertainties are 1σ), which corresponds to a ∼5.6% uncertainty contribution for H 0 assuming 70 km s−1 Mpc−1. We also constrain the absolute magnification of each image to μ a = 4.3 − 1.8 + 1.6 , μ b = 7.6 − 2.6 + 3.6 , μ c = 6.4 − 1.5 + 1.6 by comparing the observed peak near-IR magnitude of SN H0pe to the nonlensed population of SNe Ia.

Item Type:	Article
Uncontrolled Keywords:	0201 Astronomical and Space Sciences; 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; 0306 Physical Chemistry (incl. Structural); Astronomy & Astrophysics
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	American Astronomical Society
Date of acceptance:	14 March 2024
Date of first compliant Open Access:	3 October 2024
Date Deposited:	03 Oct 2024 14:04
Last Modified:	03 Oct 2024 14:15
DOI or ID number:	10.3847/1538-4357/ad3c43
URI:	https://ljmu-9.eprints-hosting.org/id/eprint/24396

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